ANSC 2120 Lecture Notes - Lecture 4: Hemicellulose, Lignin, Plant Cell
22 Feb 2016
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Two different approaches of lab assessment of nutritive feed value: chemical analysis, in vitro digestion (cid:1) (cid:1) (cid:1) and thus nutritive value by. Relative concentrations of available vs. unavailable components (cid:1) (cid:1) Concentration of organic structures or inhibitors that may limit the availability of associated nutrients. Total fiber (mostly structural carbs: nitrogen-free extract (nfe) Calculated as the difference between total dry matter and the sum of crude protein, ether extract, and crude fiber. All of these assumptions are partly false. Assessment of nutritive value of feeds (cid:1) (cid:1: most serious error is that the crude fiber measurement underestimates total fiber content (cellulose, hemicellulose, and lignin) Automatically means that the calculated nfe value overestimates nonstructural carbs. This approach largely overcomes the limitations of the. Weende crude fiber measurement by defining two fractions: neutral detergent fiber (ndf) Residue consisting of major plant cell wall components (cellulose, hemicellulose, lignin) left after the extraction of soluble organic constituents with neutral detergent solution.
